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TUSB2046B: Crystal drive level, other questions

Mir M
Prodigy 30 points
Part Number: TUSB2046B

Tool/software:

Greetings!

Would appreciate your response on the following questions:

1. Is a crystal with drive level of 100uW appropriate for the design? some hub chips mention minimum of 500uW

2. TUSB datasheet says one each of 0.1uf, 0.01uf per VCC pin, however, EVM SLVP159 has only one each for both of the VCC pins. Is this ok for final design?

3. Reset circuit in schematics show 15k with 1uf. If a 4.7uf cap is used instead of 1uf, will the hub function be affected other than 4x longer reset time?

Thanks in advance!

  • +1
    TI__Guru*** 135265 points
    Mir M said:
    1. Is a crystal with drive level of 100uW appropriate for the design? some hub chips mention minimum of 500uW

    100 uW should be good for TUSB2046B

    Mir M said:
    2. TUSB datasheet says one each of 0.1uf, 0.01uf per VCC pin, however, EVM SLVP159 has only one each for both of the VCC pins. Is this ok for final design?

    0..1uf for each VCC should be fine.

    Mir M said:
    3. Reset circuit in schematics show 15k with 1uf. If a 4.7uf cap is used instead of 1uf, will the hub function be affected other than 4x longer reset time?

    it depends on total reset time less than 10ms should be fine.

    Best

    Brian